The circuit described here is of an economical smooth variable power supply which offers 0V to 24V. It provides all controls and short circuit protection with acceptable regulation and a ripple free supply and yet uses very few components.
The transformer used is a readily available 12V-0-12V, 2A type connected at the end terminals for 24V, 1A output. After rectification and filtering, a constant reference voltage is obtained by the 24V, 500mW zener diode.
PARTS LIST | |
R1 | 1kΩ 0.5W |
R2 | 820Ω 0.5W |
R3 | 0.6Ω 1W |
VR1 | 470Ω LIN |
VR2 | 10K LIN |
VR3 | 10Ω 1W |
C1 | 2200µF 50V |
C2 | 200µF 50V |
D1 | 5A Diode Bridge |
D2 | 2A Diode |
D3 | 24V 500mw zener |
T1 | 2N 3055 |
T2 | SL 100 |
T3 | BC 148B |
X1 | SEC 24V, 1AMP |
The pots used for voltage variation are 23mm carbon-film linear type and for current limit 10 ohm, 1w wirewound type is used. All the components can be connected on a group board. Necessary heatsinks should be provided for both SL100 and 2N3055.
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